Combined boiler and furnace.



PATENTED NOV. 1, 1904.

W. W. BONSON.

COMBINED BOILER AND FURNACE.

-APPLIOATION FILED MAY 19. 1903.

N0 MODEL.

UNITED STATES Patented November 1. 1904.

PATENT OFFICE.

VVILLIAMNV. BONSON, OF DUBUQUE, IOWA, ASSIGNOR- TO BONSON FUR NAOE AND BOILER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

COMBINED BOILER AND FURNACE.

SPECIFICATION forming part of Letters Patent No. 773,779, dated November 1, 1904.

Application filed MaylQ, 1903.

To all whom, it may concern:

Be it known that I, WILLIAM W. BoNsoN, a citizen of the United States, residingin the city and county of Dubuque and State of Iowa, have invented certain new and useful Improvements in a Combined Boiler and Furnace; and I do hereby declare the following to be afull, clear, and exact description of the invention, which will enable others skilled in the art to I which it appertains to make and use the same. My invention has reference to combined steam-boilers and furnaces, especially such as have their furnaces situated within the shell of the boiler, or what are known as internally-fired boilers; and the leading object is to produce such a rapid and free circulation of the water in the boiler that most of the heat of the furnace will be conserved.

It consists, essentially, in one or more furnaces, to the rear of which are attached firefiues which extend backward and are in communication with the fines of a tubular boiler placed above the furnace and fines.

It also consists in connections between the 2 5 water in the upper boiler and the water surrounding the furnaces and fire-fines of the lower boiler, whereby a free circulation is effected between the different parts of the boiler. For a better understanding of the mode of construction and manner of operation attention is called to thefollowing specification, when taken in connection with the accompanying drawings, forming a part hereof, and in which- Figure 1 is a longitudinal section of the boiler and furnace. Fig. 2 is a vertical section in the rear of the fire-box.

Like characters of reference denote corresponding parts in each of the drawings.

Referring to the drawings, A designates the lower boiler, which consists of a cylindrical shell B, within which is set a furnace D with fire-fines E. The furnace D is preferably corrugated and of cylindrical shape and is connected at its front end to the front end of the cylindrical shell B. WVithin the corrugated furnace are set grate-bars F, which rest at their forward ends on a transverse bar Gr, 10-

' lower boiler A and the upper boiler N.

Serial No. 157,803. (No model.)

cated near the front end of the fire-box (Z and at their rear ends on a like bar H, located at the inner edge of the bridge-wall I. This grate partitions horizontally the furnace proper into a fire-box above and ash-box L beneath. Atthe rear end of the fire-box (Z or the rear of the bridge-wall I is secured a finesheet J and a like flue-sheet K at the rear of the furnace, and between these two flue-sheets are set fire-fines E, rolled in or secured in the flue-sheets in any well-known manner. This lower boiler A thus constructed with furnace inclosed and water-space surrounding the furnace between the shell and furnace is set at a slight incline upward from front to rear upon legs M and forms the base of my combined boiler and furnace. Above this boiler is set another boiler, N, on preferably a horizontal plane. This boiler is practically a tubular boiler and is constructed with front and rear flue-sheets O, into which are secured smokeflues P. These are surrounded by a shell Q, sufliciently large to furnish a water-space around the flues and steam-chamber R above the fines. These boilers A and N are connected together by a water-leg S in front and water-leg Tin the rear, which Water-legs open into both boilers. As the boiler N is set horizontally and the boiler A on an incline, the rear water-leg T will be somewhat shorter than the front Water-leg S. At the rear of both boilers and connected thereto is a combustion-chamber W, which forms the back connection between the smoke-fines in the The back connection W is formed by an iron casingX and reinforced by fire-brick Y. It will be observed that bythis construction there are formed two independent boilers, the lower carrying a furnace with fire-box and combustion-chamber and surrounded by water and the upper boiler provided with smoke-fines surrounded by water and a steam-chamber therein and the furnace of the lower boiler in communication with the fines of the upper boiler and the water in the upper boiler in communication with the water in the lower boiler.

The manner in which the results are effected is substantially as follows: Water is admitted to the upper boiler and passes through the water-legs, filling the lower boiler and entirely surrounding the furnace and smokefines Land then filling the upper boiler to a few inches above the smoke-fines. The fire is then started on the grate and the products of combustion pass out of the fire-box through the fiucs L into the back connection U, up through the fines in the upper boiler, and out the smoke-stack or chimney. As soon as the water in the lower boiler has become sufficiently heated it will move along the concave surface of the cylindrical shell B, up through the water-legl,into the upper boiler,where the steam is released and passes into the steamchamber. At the same time the water in the upper boiler will pass down through the water-leg S, and thus there will be established such a rapid and positive circulation between the boilers that the heating-surfaces will be kept clean and will be in condition to absorb the greatest number of heat units from the products of combustion, and most of the heat will thereby be conserved.

It is manifest that more than one of these furnaces may be used with a boiler and operate together in the same manner as a single furnace, and it is also manifest that it is not a necessity to have the furnace corrugated or in cylindrical shape; but it may be made in other shapes. However, I prefer that it be a cylindrical shape and corrugated and also set on an incline.

Having now described my invention, what I claim is l. A combined furnace and boiler, comprising a lower tubular boiler, legs having inclined upper portions supporting said boiler at an incline, a cylindrical furnace within said boiler having a corrugated body portion and flangeforming end portions, the forward flange engaging the boiler, a flue-sheet engaging the rear flange within the same, flues carried by said sheet, a bridge-wall carried within the furnace having a transverse supporting-bar thereon, a second transverse bar carried by the furnace, a grate mounted on the transverse bars, a water-space around the furnace, an upper tubular boiler horizontally supported having flues therein, a flue-forming wall extending from below the flues of the lower boiler to a point above the fines of the upper boiler establishing a connection between the flues of the two boilers, and water-legs mounted at the forward and rear ends of both boilers connecting the same, substantially as set forth.

2. In combination, a boiler and furnace, comprising an inclined lower boiler, a cylindrical furnace within said boiler having a corrugated shell and flanges at each end thereof, a flue-sheet secured within the rear flange of the furnace, a water-space between the furnace and shell of the boiler, fiues extending from the flue-sheet to the rear of the boiler, an upper horizontally-supported boiler, flues therein, a combustion-chamber formed by a wall extending from the lower boiler beneath the fiues thereof to a point above the fines of the upper boiler, and water-legs connecting the two boilers at the forward and rear ends thereof, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM l/V. BON SON. Witnesses:

M. M. GADY, R. WV. KEMLER. 

